This tiny magnetic blob could change how we treat brain tumors forever...
Researchers at ETH Zurich have developed magnetic gelatin blobs that can be guided through the bloodstream to brain tumors, where they release targeted drugs with doses 7,000 times lower than traditional chemotherapy. The treatment uses low-strength magnets to navigate the blobs and alternating magnetic fields to heat and dissolve them at the tumor site.
Summary
Current brain tumor treatments like chemotherapy are ineffective and overly broad in their approach, described as using a grenade to kill a mosquito. ETH Zurich researchers have created an innovative solution: small gelatin blobs coated with iron oxide that can be injected into the bloodstream. These blobs are guided through the body using low-strength magnets at speeds up to 80 centimeters per second directly to the tumor location. Once positioned at the tumor, doctors flip the magnetic fields back and forth, which deforms the gelatin ball and causes it to heat up. This heating causes the blob to dissolve and release the encapsulated drug precisely at the tumor site, allowing for targeted drug delivery. Clinical trials at the university have demonstrated remarkable results, achieving drug dosages that are 7,000 times lower than what is required with traditional chemotherapy, suggesting both improved efficacy and dramatically reduced side effects.
About this episode
Scientists have developed a new way to provide treatment for brain tumours. Currently we use chemotherapy, but that's like throwing a grenade at a mosquito, you end up damaging a lot more than you mean to. This magnetic blob will help change that. References: Microrobots: https://www.science.org/stoken/author-tokens/ST-3054/full https://www.nature.com/articles/d41586-025-03754-6 https://www.washingtonpost.com/science/2025/11/19/robot-drugs-side-effects-magnets/ Catheters: https://www.science.org/doi/full/10.1126/scirobotics.adh0298 Telesurgery: https://www.science.org/doi/10.1126/scirobotics.ado3187 https://www.science.org/doi/full/10.1126/scirobotics.adq0192 Electromagnetic Navigation Systems: https://advanced.onlinelibrary.wiley.com/doi/10.1002/adma.202310701 Magnetic Levitation: https://www.youtube.com/watch?v=WT8129liuQc
Key Insights
- Current chemotherapy for brain tumors is indiscriminate and inefficient, described metaphorically as using a grenade to kill a mosquito due to its broad-spectrum approach
- The magnetic blob system achieves dosages 7,000 times lower than traditional chemotherapy while treating brain tumors, demonstrating dramatic improvement in drug efficacy and targeting precision
- The treatment mechanism uses alternating magnetic fields to deform the gelatin blob, causing it to heat up and dissolve specifically at the tumor site to release the drug payload
Topics
Transcript
[0:00] This magnetic blob might one day save your life. Why? Cuz doctors right now are struggling to treat brain tumors. They can use chemotherapy, but it's like using a grenade to kill a mosquito. That's why researchers at ETH Zurich have developed this. It's a little gelatin blob that's wrapped in an iron oxide coating, and it's going to change everything. They inject the blob into your bloodstream, and then using low-strength magnets guide it at speeds up to 80 cm a second right to the tumor. Once it's there, they can then flip the magnetic fields back and forth, which deforms the gelatin ball causing it to heat up, dissolving it, and then [0:31] releasing the drug so…
Full transcript available for MurmurCast members
Sign Up to AccessMore from Veritasium
How Dangerous Are Non-Stick Pans?
Non-stick pans present three main concerns: Teflon itself is chemically inert and harmless if ingested, but overheating above 300°C can release harmful fumes; the chemicals used to manufacture the coating (PFAs or 'forever chemicals') are more dangerous and can leak into the environment; and research on whether these manufacturing chemicals end up on pans and their health effects as microplastics remains incomplete.
We're trying something new...
Veritasium launches a new channel called Ingenious focused on social science stories. The first video explores how Malcolm McLean's shipping container invention revolutionized global commerce, starting with his observation of inefficient cargo loading in 1954 and leading to the creation of the SS Ideal X in partnership with engineer Keith Tantinger.
What happens to these balloons when you open the valve?
A demonstration shows that when a valve opens between a large and small balloon, the large balloon gets bigger while the small one gets smaller—counterintuitively because the smaller balloon actually has higher pressure. This occurs because polymer chains in rubber are tangled when the balloon is small and unexpanded, making it stiffer, but relax as the balloon inflates, resulting in lower pressure in larger balloons.
The Insane Real Engineering of the Nazis' Enigma
This video explains how the Enigma encryption machine worked, why it was initially unbreakable, and how British codebreakers at Bletchley Park—led by Alan Turing—developed the Bombe machine to systematically crack Nazi messages by exploiting mathematical principles and human operator errors. The breakthrough intelligence shortened World War II by an estimated two years.
How An Orbit Can Heat A Moon
Europa's eccentric orbit around Jupiter, caused by orbital resonance with Io and Ganymede, results in constant tidal flexing that generates internal heat through friction. This tidal heating mechanism is strong enough to keep Europa's subsurface ocean liquid, with the effect being even more pronounced closer to Jupiter, explaining Io's extreme volcanic activity.